BK7 Double Concave Lenses
Description
Double concave lenses (DCV) is similar with plano concave lens. The focus length is negative. It can make parallel light diverge outside. The two sides have same radius of curvature. Double convex lens generally used for expanding beam of light and projection etc. BK7 double concave lens has excellent transmittance from visible to near infrared wavelength (350-2000nm).
BK7 Double Concave Lenses
Specifications |
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|---|---|
| Material: | BK7, UVFS, CaF2, ZnSe, H-K9L |
| Diameter: | 3-50 mm |
| Focal Length: | -6~-75 mm |
| Edge Thickness, Te: | 1-16 mm |
| Lens Type: | Bi-Concave |
Features
- Material: BK7
- Design Wavelength: 587.6nm
- Diameter Tolerance: +0.0/-0.1mm
- Center Thickness Tolerance: ±0.1mm
- Surface Figure: λ/4 @633nm
- Focal Length Tolerance: ±1%
- Centration: 3 arc min.
- Surface Quality: 40/20-60/40
- Bevel: 0.2×45°
- Coating: Uncoated or Customized AR
Applications
- Optical system
For pricing, technical or any other questions please contact the supplier
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How to order?
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Ships from:
China
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Sold by:
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On FindLight:
since 2023
Frequently Asked Questions
Double concave lenses have a negative focal length and can make parallel light diverge outside, while plano concave lenses have a flat surface on one side and a concave surface on the other.
The design wavelength of the BK7 double concave lens is 587.6nm.
The diameter tolerance of the BK7 double concave lens is +0.0/-0.1mm.
The surface figure of the BK7 double concave lens is λ/4 @633nm.
Yes, the BK7 double concave lens can be either uncoated or customized with AR coating.